GAGANYAAN

Less than two months after the successful Chandrayaan-3 Moon landing, the Indian Space Research Organization (ISRO) is embarking on a crucial mission. This mission, known as the Flight Test Vehicle Abort Mission-1 (TV-D1), is the first in a series of tests aimed at launching an Indian astronaut into space, possibly in 2025. The TV-D1 mission will demonstrate the Crew Escape System of the Gaganyaan project, ensuring the safety of astronauts in case of emergencies.

2. Gaganyaan Mission

• Gaganyaan, meaning "Sky Craft" in Sanskrit, is India's ambitious human spaceflight program aimed at sending Indian astronauts to space.
• It is a testament to India's growing prowess in the field of space exploration and a source of immense national pride.
• The program, spearheaded by the Indian Space Research Organisation (ISRO), envisions launching a crewed orbital spacecraft into low Earth orbit (LEO) for a period of up to seven days.
• The spacecraft will carry three astronauts, marking a historic first for India.

3. About The TV-D1 Mission

• The TV-D1 mission consists of two abort missions designed to test the safety mechanisms that will allow the Gaganyaan crew to escape the spacecraft during emergencies.
• In this mission, a rocket will ascend to an altitude of nearly 17 km before an abort signal triggers the separation of the crew module.
• The crew module will then descend using a parachute for a splashdown in the Bay of Bengal.
• The TV-D1 mission will have a total duration of 532 seconds, from liftoff at 8 a.m. to the crew module's splashdown about 10 km from the Sriharikota coast.
• The rocket used for this mission is ISRO's low-cost Test Vehicle, designed specifically for system testing.
• During the flight, the rocket will reach a peak relative velocity of 363 meters per second, approximately 1307 km per hour. It's important to note that the crew module will be empty for this test.

4. Key Objectives of the TV-D1 Mission

The TV-D1 mission serves two primary objectives.

1. It aims to demonstrate the capabilities of the new Test Vehicle, hence its name Test Vehicle-Demonstration 1 (TV-D1).
2. It will showcase a basic version of the crew module, testing the systems responsible for separating the crew module from the rocket during an abort mission and ensuring the safe escape of astronauts.

The TV-D1 mission simulates an abort condition during the ascent trajectory, corresponding to a Mach number of 1.2, as anticipated in the Gaganyaan mission.

5. The Low-Cost Test Vehicle

• Unlike the upcoming full-fledged test flight of the crew module into space and back, which will use the human-rated LVM3 rocket in 2024, the TV-D1 mission employs a low-cost basic rocket.
• This Test Vehicle utilizes existing liquid propulsion technology but introduces innovations such as the throttleable and restartable L110 Vikas engine, capable of controlling propellant use.
• ISRO developed this cost-effective solution as each GSLV Mk III launch, which was previously used for such missions, costs between Rs 300-400 crore.

6. Safety and Crew Escape System

• Safety remains a top priority for ISRO in the Gaganyaan project, especially in light of international incidents involving space missions.
• The TV-D1 mission aims to test the systems ensuring the crew module's safety, such as environmental control, life support systems, and an integrated vehicle health management system.
• This system can detect anomalies that may jeopardize astronauts' safety and initiate mission abort procedures.

7. Preparations and Timeline for Gaganyaan

• ISRO has set a target timeframe for the Gaganyaan mission in 2024, with flexibility based on the development stages and ensuring the mission's safety.
• The schedule includes an unmanned mission at the beginning of the next year, abort missions this year, and discussions of the manned mission for late 2024 or early 2025.
• ISRO has completed the human rating of the LVM 3 rocket and performed static tests for human-rated solid rocket boosters.

8. Conclusion

The TV-D1 mission represents a significant milestone in the Gaganyaan program, as it integrates a near-complete system for a flight test. The success of this mission paved the way for further qualification tests and unmanned missions, ultimately leading to the first Gaganyaan mission with Indian astronauts. ISRO's dedication to safety and rigorous testing is paramount as India advances its space exploration endeavours.